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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (22): 2618-2622. 上一篇    下一篇

研究论文

湿法脱硫中亚硫酸盐非催化氧化本征动力学

汪黎东*，赵毅*，李蔷薇，陈传敏   

  1. (华北电力大学环境科学与工程学院 保定 071003)
  • 投稿日期:2007-01-23 修回日期:2007-06-14 发布日期:2007-11-28
  • 通讯作者: 汪黎东

Non-catalyzed Intrinsic Oxidation Kinetics of Sulfite in Wet Desulfurization Process

WANG Li-Dong*; ZHAO Yi*; LI Qiang-Wei; CHEN Chuan-Min   

  1. (School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003)
  • Received:2007-01-23 Revised:2007-06-14 Published:2007-11-28
  • Contact: WANG Li-Dong

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691

被引次数

59

亚硫酸盐的氧化是湿法烟气脱硫工艺中的重要过程. 利用间歇式反应装置, 研究了亚硫酸盐非催化氧化的本征反应动力学. 结果表明, 该反应分为两个阶段进行, 即富氧区的快速反应和贫氧区的慢速反应. 在富氧区, 亚硫酸盐和溶解氧的分级数分别为1.0和1.0, 反应的表观活化能为49.3 kJ•mol－1; 在贫氧区, 亚硫酸盐和溶解氧的分级数分别为2.0和0, 反应的表观活化能为122.6 kJ•mol－1. 对反应的机理进行了预测, 结果与实验现象有较好的吻合.

关键词: 脱硫, 亚硫酸盐, 非催化氧化, 本征反应, 动力学

Oxidation of sulfite is an important process in wet flue gas desulfurization. The non-catalyzed intrinsic oxidation kinetics of sulfite was experimentally studied in an intermittent apparatus, showing that the oxidation reaction proceeded with two steps, one rapid reaction in rich oxygen zone and the other slow reaction in poor oxygen zone. In the rich oxygen zone, the reaction is 1.0 order for sulfite and 1.0 order for dissolved oxygen, and the activation energy is 49.3 kJ•mol－1. In the poor oxygen zone, the reaction is 2.0 order for sulfite and zero order for dissolved oxygen, and the activation energy is 122.6 kJ•mol－1. The reaction mechanism was hypothesized, which is in good agreement with the experimental results.

Key words: desulfurization, sulfite, non-catalyzed oxidation, intrinsic reaction, kinetics